Updating Loki Test Values and version to 5.21.0-bb.1

Package Merge Request

Package Changes

Fixes our tests to work with Loki 2.9+ here is another BB MR pipeline using the cypress-loki-modern branch for loki and passing

https://repo1.dso.mil/big-bang/bigbang/-/jobs/26115553

Package MR

(Link to Package MR here)

For Issue

Closes #1732 (closed)